September in Katori-shi averages a daily high of 26.1°C with nights around 21.3°C. Expect roughly 11.2 wet days totalling 209.3mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Katori-shi is May–October.
Based on CHOSHI, JA (36.5km), 1995–2024. 21 years of September data.